All microorganisms are best defined as organisms that

A. cause human disease.
B. lack a cell nucleus.
C. are infectious particles.
D. can only be found growing in laboratories.
E. are too small to be seen with the unaided eye.


Answer: E

Biology & Microbiology

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Which of the following choices best describes the relationship that exists between moisture and air temperature? 

A. The moisture-holding capacity of air decreases when it is warm and increases when it is cool. B. The moisture-holding capacity of air remains the same (warm or cool) and is not related to its temperature. C. The moisture-holding capacity of air increases when it is warm and decreases when it is cool. D. The moisture-holding capacity of air decreases as the higher altitude winds of the polar regions descend onto the continents.

Biology & Microbiology

The unexpressed regions of split genes are called

A. exons. B. introns. C. endons. D. codons.

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In contrast to alpha radiation, beta radiation:

A) is easily stopped by a piece of paper. B) travels slowly and is less penetrating. C) can easily penetrate the human body. D) requires a layer of clothing to stop it.

Biology & Microbiology

A cause of epiglottitis in children and young adults is

A. Haemophilus influenzae. B. Haemophilus ducreyi. C. Haemophilus aegyptius. D. Haemophilus parainfluenzae. E. Haemophilus aphrophilus.

Biology & Microbiology